If you observe a body of literature and you can formulate from it another research, this could be a twigging of a research into new research domains, not necessarily a review paper.
In my process of writing come additional remarks in the text nearly always. So the text and references get more manifoldly but perhaps also overcharged. There are several possibilities. To change the structure by adding one ore ore chapters, or to develop a long and a short version of your text. Finally you may discover a variation of the initial leading question of your research topic. Such processes extend the whole article or book, but in my experience it is no disadvantage
I disagree with whom said that " the formulation of a paper from literature make review article not research article"; even when you want write a research paper you should read and do a literature search to define the results, the strengths and the weaknesses of other papers.
I am not exactly sure of the question.... but my own process is whenever working on a research project... I always reveiw the literture to "ground" the research questioin and make sure there hasn't been an earlier project done on this same topic/question. I do find that as I get deeper into a research question there seem to be many variations on a theme... so it is always possible to write a different paper on a smaller or slightly differnet theme.... but also the process is to Review the Literature before writing the actual paper.